MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-9
·
IF 6.232
Li Chi,Zhang Yuanyuan,Li Chunya,Wan Qijin,Ke Qiang,Yang Nianjun
Four CeO 2 nanomaterials with the morphologies of a nanoplate (CeO 2 -p), a nanocube (CeO 2 -c), a porous triangular microplate (CeO 2 -t), and of a porous hierarchical rod-stacked nanobundle (CeO 2 -b) were synthesized using a hydrothermal method. They were characterized by scanning and transmission electron microscopies, X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical characterizations reveal the tuning of their morphology and the presence of exposed crystal planes of CeO 2 that can be realized by changing the alkali sources. Among these materials, the CeO 2 -b features the largest specific surface and lowest electron transfer resistance towards the redox probe Fe(CN) 6 3-/4- . The best voltammetric response to dopamine and epinephrine is thus achieved by using the Nafion-CeO 2 -b coated electrode. A sensitive and selective method was developed that can voltammetrically detect dopamine (with a peak near 0.13 V vs. SCE), and epinephrine (with a peak near 0.25 V vs. SCE). The detection limits are 2.9 and 0.67 nM, respectively.
Schematic representation of morphology tailoring of CeO 2 and electrochemical sensing of dopamine and epinephrine on these CeO 2 samples with different morphologies
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Arabian Journal of Geosciences
·
2020
·Vol. 13
·期 2
·1-13
·
IF 1.327
Zou Jirui,Yue Xiangan,Dong Jie,Gu Jun,Fu Joseph Yuchun,Wang Liqi,Mou Yufan
In order to enhance the low recovery efficiency in low-permeability and heterogeneous reservoirs resulted by water channeling during water flooding process, a series of flooding experiments using in situ polymerization microsphere (ISPM) with surfactant were conducted to achieve deep profile control in high conductivity water channels. Dynamic pressure measurement showed that ISPM demonstrated good injectability and profile control effect in low-permeability core of 20.22 mD, as the plugging rate was as high as 78.99%. At the same time, the electron microscopy results showed that the ISPM could migrate deeper into the core to form microsphere clusters to block the high conductivity channels. The core flooding experiments showed that the profile control effect of the composite slug consisted of surfactant and ISPM was much better than that of just ISPM alone. The front part of the slug consisting of BA with strong emulsifying capability and ultra-low interfacial tension can better exert the profile control effect of the ISPM and expand the sweep volume of the subsequent displacing agent better than surfactant TS with ultra-low interfacial tension. As a subsequent oil displacing agent after ISPM + BA profile control, surfactant BA with strong emulsifying capability and ultra-low interfacial tension, compared with AES and TS, achieved higher recovery efficiency. In low-permeability and heterogeneous reservoirs, ultra-low interfacial tension is screening crucial characteristic of surfactant, but emulsification capacity also plays a very important role. Combination of surfactant BA and ISPM could fully utilize the profile control effect of ISPM and the oil stripping effect of surfactant; the stage recovery efficiency was as high as 22.52%.
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CELLULOSE
·
2021
·Vol. 28
·期 14
·9413-9424
·
IF 5.044
Wu Rina,Li Yanan,Shi Jiahui,Wang Qiuyu
Cellulosic materials show great superiority in oil/water separation owing to abundance, low cost, renewability and biodegradability. Herein, silylated cellulose graft copolymer (C-PGMA-S) was prepared by combing ATRP grafting of glycidyl methacrylate with ring-opening reaction between epoxy groups in grafted chains and amine groups in (3-Aminopropyl)- triethoxysilane. C-PGMA-S was utilized to construct hydrophobic surface for filter paper substrate conveniently through dipping and drying. As the curing proceeded, water contact angle of the modified paper increased from 77° to 128°. Inhomogeneous coverage on the pores and micro-scaled irregular concavities were observed by scanning electron microscopy (SEM) on modified paper, resulting in decreased porosity and increased roughness. Moreover, bursting strength was improved by 27%. An efficiency of 96.8% was achieved using the modified paper for oil/water separation. The modified paper exhibited moderate reusability with the separation efficiency remaining over 90% after reuse for 8 cycles without renewing process and good stability against pH variations. The C-PGMA-S modified filter paper, which is fluorine-free, might be a potential candidate for oil/water separation.
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Journal of Bionic Engineering
·
2021
·Vol. 18
·期 4
·887-899
·
IF 2.682
Tian Yanling,Feng Jiekai,Cai Zexin,Chao Jiaqi,Zhang Dawei,Cui Yuxiao,Chen Faze
Reckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival. Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation. However, further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment. Herein, we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh (SSCM). The prepared SSCM possesses excellent water repellence and oil affinity, enabling it to successfully separate various oil-water mixtures with high separation efficiency (e.g., > 99% for hexadecane-water mixture). The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures, indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh. Additionally, the efficiency can be well maintained during 50 cycles of separation, and the water repellence is even stable after storage in air for 120 days, demonstrating the reusability and long-term stability of the SSCM. Furthermore, the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper, and oil-water separation efficiency of > 96% can be obtained after 10 cycles of abrasion. The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh, and thereby be a great candidate for treating large-scale oily wastewater in harsh environments.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 4
·1145-1159
·
IF 3.186
Yu Guiyun,Zhao Yefan,Zhang Yulong,Wu Jiaxin,Liu Chao
There are increasing concerns of environmental-pollution and energy issues. Herein, an exfoliation-restacking process was firstly employed to synthesize H + -restacked H + Ti 2 NbO 7 − nanosheets (HTNS), and then heated with melamine at 510 °C to obtain direct Z-scheme layered N-doped H + Ti 2 NbO 7 − /g-C 3 N 4 (TCN) heterojunctions with an increased specific surface area. Two-dimensional (2D) g-C 3 N 4 material was in-situ formed on the surface of HTNS to achieve a layered heterostructure between two components, which could maximize interfacial contact area and minimize interfacial distance for the efficient charge carrier separation. Simultaneously, the surface of HTNS was doped by nitrogen atoms to form visible-light-responsive N-doped HTNS. All TCN x ( x = 1, 2 and 3) composites exhibited the enhanced photocatalytic activity for both hydrogen (H 2 ) production and rhodamine B (RhB) degradation. As an optimal sample, the resulted TCN2 composite exhibited the best photocatalytic efficiency for H 2 production and RhB degradation. The enhanced photocatalytic activity was assigned to the combined effects of layered heterojunction, N-doping and large specific surface area. According to trapping experiments and electron spin resonance (ESR) spectra, the holes (h + ), superoxide (·O 2 − ) and hydroxyl (·OH) radicals were responsible for photocatalytic RhB degradation and especially the ·O 2 − was the key active specie. A possible charge transfer pathway was analyzed in detail. This work will hopefully provide some guidance on designing Z-scheme layered heterojunction photocatalyst systems with highly photocatalytic efficiency. Graphical Abstract Direct Z-scheme layered N-doped H + Ti 2 NbO 7 − /g-C 3 N 4 heterojunction photocatalysts were constructed by a three-step exfoliation-restacking-calcination process, showing the highly photocatalytic efficiency for H 2 production and RhB degradation under visible light due to the synergistic effects of layered heterojunction, N-doping and large specific surface area.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 30
·期 3
·1127-1140
·
IF 3.667
Wang Jun,Yang Le,Li Xiaolong,Luo Zhu,Li Jianjun,Xia Xiaosong,Linghu Changkai
Incompatible polypropylene (PP) and polyethylene (PE) are difficult to separate in mixed recycling streams such as waste plastic packaging, which makes polyolefin mixtures unsuitable for high-quality products. In this work, based on the free radical branching reaction, a co-branching reaction of isotactic polypropylene (iPP) and high-density polyethylene (HDPE) blends was carried out in the presence of the peroxide, free radical regulator and multifunctional acrylate monomer, and a star-like long-chain branching (LCB) copolymer was obtained. The effect of in situ compatibilization on the structures and mechanical properties of iPP/HDPE was investigated, and the compatibilization mechanism was discussed. Results showed that the mechanical properties of the modified blends were largely improved, and efficient in-situ compatibilization of iPP and HDPE could be taken place in a wide process window. Moreover, the sizes of the dispersed phase in the modified blends were clearly decreased, and the interfacial thickness increased. Compared with the pure iPP/HDPE blend, the initial crystallization temperature of iPP in the modified iPP/HDPE blend was increased, and long branched chains of the LCB copolymers were physically entangled with the chemical identical homopolymers or even participated in the crystallization of iPP and HDPE. Thanks to the in situ compatibilization strategy, the compatibility of iPP/HDPE was significantly improved.
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Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 5
·1119-1128
·
IF 6.707
Zhong Mingqiang,Feng Qin,Yuan Changlai,Liu Xiao,Zhu Baohua,Meng Liufang,Zhou Changrong,Xu Jiwen,Wang Jiang,Rao Guanghui
In this work, the (1− x )Bi 0.5 Na 0.5 TiO 3 - x BaNi 0.5 Nb 0.5 O 3 (BNT-BNN; 0.00 ⩽ x ⩽ 0.20) ceramics were prepared via a high-temperature solid-state method. The crystalline structures, photovoltaic effect, and electrical properties of the ceramics were investigated. According to X-ray diffraction, the system shows a single perovskite structure. The samples show the normal ferroelectric loops. With the increase of BNN content, the remnant polarization ( P r ) and coercive field ( E c ) decrease gradually. The optical band gap of the samples narrows from 3.10 to 2.27 eV. The conductive species of grains and grain boundaries in the ceramics are ascribed to the double ionized oxygen vacancies. The open-circuit voltage ( V oc ) of ∼15.7 V and short-circuit current ( J sc ) of ∼1450 nA/cm 2 are obtained in the 0.95BNT-0.05BNN ceramic under 1 sun illumination (AM1.5G, 100 mW/cm 2 ). A larger V oc of 23 V and a higher J sc of 5500 nA/cm 2 are achieved at the poling field of 60 kV/cm under the same light conditions. The study shows this system has great application prospects in the photovoltaic field.
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Journal of Analysis and Testing
·
2021
·Vol. 6
·期 4
·401-410
·
IF 0
Qiao Li-Zhen,Yu Chun-Mei,Sun Rui-Ting
In the present work, a novel amino-functionalized hexaalkylguanidinium chloride ionic liquid was prepared and grafted on the surface of magnetic materials through polyethyleneimine to enrich polycyclic aromatic hydrocarbons in water in combination with HPLC equipped with an ultraviolet detector. The effect of several parameters on the extraction efficiency was investigated, including the desorption solvent, the amounts of sorbents, the extraction time, the desorption time and the salt amount. Under the optimized conditions, the method validation exhibited good linearity with correlation coefficients above 0.994 in the range of 0.2–300 ng/mL and low limits of detection and quantification of 0.05 and 0.2 ng/mL, respectively. Besides, relative recoveries were in the range of 80–120%, and the intra-day and inter-day repeatability were good with the relative standard deviations of less than 20%. Finally, the guanidinium ionic liquid modified magnetic materials were applied for the extraction of polycyclic aromatic hydrocarbons from real water samples to demonstrate the utility, and the results show that the proposed method has good prospect for effective enrichment and determination of pollutants in water.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 48
·69301-69313
·
IF 4.223
Xiao
Ruyi,Zhang Yuanyuan,Wang Shuangfei,Zhu Hongxiang,Song Hainong,Chen Guoning,Lin Hongfei,Zhang Jian,Xiong Jianhua
The heterogeneous photo-Fenton-like process is emerging as a promising treatment of antibiotics-containing wastewater. The preparation of new efficient and stable catalysts is one of the research fields. A composite catalyst, prussian blue (PB) modified CeO 2 was prepared, characterized, and applied for photo-Fenton oxidation of norfloxacin (NOR) in this study. It was found that chemical doping of PB leaded to more oxygen vacancies and increased the surface area of CeO 2 obviously. PB/CeO 2 with more Ce 3+ facilitated electron transfer between Fe 3+ /Fe 2+ with Ce 3+ /Ce 4+ . PB could also improve the separation rate of photoexcited electron-hole pairs in CeO 2 nanostructures. When the doping ratio of PB and CeO 2 was 10%, PB/CeO 2 show the highest catalytic degradation ability and 88.93% of NOR could be degraded within 30 min. PB/CeO 2 composite showed well reactivity at the wide pH value range of 3–8. The reusable experiments and low iron dissolution with less than 1 mg/L indicated that PB/CeO 2 could be employed as an efficient heterogeneous photo-Fenton-like catalyst in organic contaminants degradation.
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International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 11
·1868-1874
·
IF 2.232
Xiong Shan-xia,Kuang Jian-lei,Zheng Qian-fang,Xiao Ting,Liu Wen-xiu,Wang Qi,Jiang Peng,Cao Wen-bin
Wood-based panels containing urea-formaldehyde resin result in the long-term release of formaldehyde and threaten human health. In this study, inorganic aluminosilicate coatings prepared by combining metakaolin, silica fume, NaOH, and H 2 O were applied to the surfaces of wood-based panels to obstruct formaldehyde release. The Si/Al, Na/Al, and H 2 O/Na 2 O molar ratios of the coatings were regulated to investigate their effects on the structure and formaldehyde-resistant barrier properties of coatings. Results showed that the cracks in the coatings gradually disappeared and the formaldehyde resistance rates of the barrier increased as the Si/Al molar ratio was increased from 1.6 to 2.2. This value also increased as the Na/Al molar ratio was increased from 0.9 to 1.2 because of the improvement of the degree of polymerization. As the H 2 O/Na 2 O molar ratio was increased from 12 to 15, the thickness of the dry film decreased gradually and led to the reduction in the formaldehyde resistance rate. When the Si/Al, Na/Al, and H 2 O/Na 2 O molar ratios were 2.2, 1.2, and 12, respectively, the inorganic aluminosilicate coating showed good performance as a formaldehyde-resistant barrier and its formaldehyde resistance rate could reach up to 83.2%.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 17
·4459-4469
·
IF 4.157
Yang Huiyi,He Qiyi,Eremin Sergei A.,Pan Junkang,Zou Yikui,Cui Xiping,Zhao Suqing
In this paper, five fluorescein-labeled dehydroepiandrosterone (DHEA) derivatives (tracers) with different chain lengths between the fluorescein and hapten were synthesized and featured so as to establish a fluorescence polarization immunoassay (FPIA) for DHEA detection in human urine samples with previously prepared polyclonal antibody against DHEA. The outcomes of the structure of tracer on FPIA sensitivity were investigated. Under the optimal condition, the fluorescence polarization value (FP) decreases linearly in DHEA concentration, ranging from 1.6 to 243.3 ng mL −1 , with the limit of detection of 1.1 ng mL −1 and IC 50 value of 25.1 ng mL −1 . Moreover, the developed FPIA was time-saving as it could complete the detection within 3 min. FPIA and commercial enzyme-linked immunosorbent assay kit were both applied to analyze the spiked human urine samples with DHEA. Excellent recoveries (92.1–108.0%) and satisfactory correlation coefficient ( R 2 = 0.98) were acquired with the two methods, indicating that the developed FPIA was a fast and efficient screening immunoassay with accuracy and sensitivity for DHEA detection in human urine samples.
Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 35
·19466-19475
·
IF 4.22
Ding Jinjin,Zhang Mengke,Wei Xiaoqing,Song Wenwu,Wang Jin,Sun Tongming,Zhu Jinli,Wang Minmin
A rational structural strategy to design rambutan-like NiFe-LDH nanocluster arrays electrode via a buffer-salt-assisted hydrothermal method was reported. For our developed electrode, large stable current density of 100 and 200 mA cm −2 at overpotential of only 283 and 300 mV in oxygen evolution reaction in alkaline electrolyte was obtained, which is dramatically lower than many previous reported overpotentials. It also exhibits low Tafel slope at current range from 10 to 25 mA cm −2 (56.47 mV dec −1 ). Further analysis demonstrates the key role of higher carriers of the rambutan-like NiFe-LDH nanocluster arrays electrode in boosting the water-splitting performance of the resulting system. Benefiting from the fine geometry shape of the self-supported nanocluster nanoarrays electrode, the transfer process of the reactants and oxygen/hydrogen bubbles is accelerated. In addition, a 19-time enhancement of carrier concentration for our developed rambutan-like NiFe-LDH nanoclusters (2.9 × 10 29 m −3 ) is obtained. Notably, the resultant rambutan-like NiFe-LDH nanocluster arrays electrode exhibits enhanced stability (in high and low current density) for the full water splitting in 1 M KOH, remaining nearly 100% of the original current density after continued testing for 20 h. This finding may provide new insight on rational structural design LDH nanostructures with high performance for electrocatalysis. Graphic abstract A highly hydrophilic NiFe-LDH nanocluster arrays electrode is developed for efficient full water splitting. Large and stable current density of 200 mA cm −2 is obtained at overpotential of 300 mV. Besides, the faraday efficiency is nearly 100%.
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